v2.0.0 - remove IE8 & 9 support

• ✂️ remove IE8 helper dependencies: doc-ready, eventie, get-style-property
• ⬆️ upgrade dependencies with IE8 drop: get-size v2, fizzy-ui-utils v2
• ↔️ switch out EventEmitter for smaller ev-emitter
• 🔧 Change isOptionName to optionName. i.e. isOriginLeft -> originLeft. add _getOption() to check backwards compatibility